📄 tl_vesa.c
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/*
** thinlib (c) 2001 Matthew Conte (matt@conte.com)
**
**
** tl_vesa.c
**
** VESA code.
**
** $Id: $
*/
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <go32.h>
#include <dos.h>
#include <dpmi.h>
#include "tl_types.h"
#include "tl_log.h"
#include "tl_bmp.h"
#include "tl_djgpp.h"
#include "tl_video.h"
#include "tl_vesa.h"
#define __PACKED__ __attribute__ ((packed))
/* VESA information block structure */
typedef struct vesainfo_s
{
char VESASignature[4] __PACKED__;
uint16 VESAVersion __PACKED__;
uint32 OEMStringPtr __PACKED__;
char Capabilities[4] __PACKED__;
uint32 VideoModePtr __PACKED__;
uint16 TotalMemory __PACKED__;
uint16 OemSoftwareRev __PACKED__;
uint32 OemVendorNamePtr __PACKED__;
uint32 OemProductNamePtr __PACKED__;
uint32 OemProductRevPtr __PACKED__;
uint8 Reserved[222] __PACKED__;
} vesainfo_t;
/* SuperVGA mode information block */
typedef struct modeinfo_s
{
uint16 ModeAttributes __PACKED__;
uint8 WinAAttributes __PACKED__;
uint8 WinBAttributes __PACKED__;
uint16 WinGranularity __PACKED__;
uint16 WinSize __PACKED__;
uint16 WinASegment __PACKED__;
uint16 WinBSegment __PACKED__;
uint32 WinFuncPtr __PACKED__;
uint16 BytesPerScanLine __PACKED__;
uint16 XResolution __PACKED__;
uint16 YResolution __PACKED__;
uint8 XCharSize __PACKED__;
uint8 YCharSize __PACKED__;
uint8 NumberOfPlanes __PACKED__;
uint8 BitsPerPixel __PACKED__;
uint8 NumberOfBanks __PACKED__;
uint8 MemoryModel __PACKED__;
uint8 BankSize __PACKED__;
uint8 NumberOfImagePages __PACKED__;
uint8 Reserved_page __PACKED__;
uint8 RedMaskSize __PACKED__;
uint8 RedMaskPos __PACKED__;
uint8 GreenMaskSize __PACKED__;
uint8 GreenMaskPos __PACKED__;
uint8 BlueMaskSize __PACKED__;
uint8 BlueMaskPos __PACKED__;
uint8 ReservedMaskSize __PACKED__;
uint8 ReservedMaskPos __PACKED__;
uint8 DirectColorModeInfo __PACKED__;
/* VBE 2.0 extensions */
uint32 PhysBasePtr __PACKED__;
uint32 OffScreenMemOffset __PACKED__;
uint16 OffScreenMemSize __PACKED__;
/* VBE 3.0 extensions */
uint16 LinBytesPerScanLine __PACKED__;
uint8 BnkNumberOfPages __PACKED__;
uint8 LinNumberOfPages __PACKED__;
uint8 LinRedMaskSize __PACKED__;
uint8 LinRedFieldPos __PACKED__;
uint8 LinGreenMaskSize __PACKED__;
uint8 LinGreenFieldPos __PACKED__;
uint8 LinBlueMaskSize __PACKED__;
uint8 LinBlueFieldPos __PACKED__;
uint8 LinRsvdMaskSize __PACKED__;
uint8 LinRsvdFieldPos __PACKED__;
uint32 MaxPixelClock __PACKED__;
uint8 Reserved[190] __PACKED__;
} modeinfo_t;
#define MASK_LINEAR(addr) (addr & 0x000FFFFF)
#define RM_TO_LINEAR(addr) (((addr & 0xFFFF0000) >> 12) + (addr & 0xFFFF))
#define RM_OFFSET(addr) (addr & 0xF)
#define RM_SEGMENT(addr) ((addr >> 4) & 0xFFFF)
#define VBE_LINEAR_ADDR 0x4000
#define VBE_LINEAR_AVAIL 0x0080
#define VBE_INT 0x10
#define VBE_SUCCESS 0x004F
#define VBE_FUNC_DETECT 0x4F00
#define VBE_FUNC_GETMODEINFO 0x4F01
#define VBE_FUNC_SETMODE 0x4F02
#define VBE_FUNC_GETMODE 0x4F03
#define VBE_FUNC_FLIPPAGE 0x4F07
#define MAX_NUM_MODES 256
short int vid_selector = -1;
static uint16 modelist[MAX_NUM_MODES];
static bitmap_t *screen = NULL;
static bitmap_t *hardware = NULL;
static int total_memory = 0;
static bool vesa_hardware = false;
/* look for vesa */
static int vesa_detect(void)
{
vesainfo_t vesa_info;
__dpmi_regs regs;
long list_ptr;
int mode_pos;
/* Use DOS transfer buffer to hold VBE info */
THIN_ASSERT(sizeof(vesainfo_t) < _go32_info_block.size_of_transfer_buffer);
memset(®s, 0, sizeof(__dpmi_regs));
strncpy(vesa_info.VESASignature, "VBE2", 4);
dosmemput(&vesa_info, sizeof(vesainfo_t), MASK_LINEAR(__tb));
regs.x.ax = VBE_FUNC_DETECT;
regs.x.es = RM_SEGMENT(__tb);
regs.x.di = RM_OFFSET(__tb);
__dpmi_int(VBE_INT, ®s);
if (VBE_SUCCESS != regs.x.ax)
return -1;
dosmemget(MASK_LINEAR(__tb), sizeof(vesainfo_t), &vesa_info);
if (strncmp(vesa_info.VESASignature, "VESA", 4) != 0)
return -1;
/* check to see if linear framebuffer is available */
if ((vesa_info.VESAVersion >> 8) < 2)
{
thin_printf("thinlib.vesa: no linear framebuffer available\n");
return -1;
}
/* build list of available modes */
memset(&modelist, 0, MAX_NUM_MODES * sizeof(uint16));
mode_pos = 0;
list_ptr = RM_TO_LINEAR(vesa_info.VideoModePtr);
while (1)
{
uint16 mode;
dosmemget(list_ptr + mode_pos * 2, 2, &mode);
if (0xFFFF == mode)
{
modelist[mode_pos] = 0;
break;
}
modelist[mode_pos++] = mode;
}
total_memory = vesa_info.TotalMemory;
return 0;
}
static int vesa_getmodeinfo(uint16 mode, modeinfo_t *modeinfo)
{
__dpmi_regs regs;
THIN_ASSERT(sizeof(modeinfo_t) < _go32_info_block.size_of_transfer_buffer);
memset(®s, 0, sizeof(regs));
regs.x.ax = VBE_FUNC_GETMODEINFO;
regs.x.cx = mode;
regs.x.es = RM_SEGMENT(__tb);
regs.x.di = RM_OFFSET(__tb);
__dpmi_int(VBE_INT, ®s);
if (VBE_SUCCESS != regs.x.ax)
return -1;
dosmemget(MASK_LINEAR(__tb), sizeof(modeinfo_t), modeinfo);
return 0;
}
static uint16 vesa_findmode(int width, int height, int bpp)
{
modeinfo_t mode_info;
uint16 mode;
int mode_pos;
for (mode_pos = 0; ; mode_pos++)
{
mode = modelist[mode_pos];
if (0 == mode)
break;
if (vesa_getmodeinfo(mode, &mode_info))
break; /* we are definitely screwed */
if (mode_info.XResolution == width && mode_info.YResolution == height
&& mode_info.BitsPerPixel == bpp)
{
return mode;
}
}
return 0;
}
int thin_vesa_setmode(int width, int height, int bpp)
{
uint16 mode;
__dpmi_regs regs;
__dpmi_meminfo mi;
modeinfo_t mode_info;
unsigned int address;
mode = vesa_findmode(width, height, bpp);
if (0 == mode)
{
thin_printf("thinlib.vesa: yikes, couldn't find mode\n");
return -1;
}
if (vesa_getmodeinfo(mode, &mode_info))
{
thin_printf("thinlib.vesa: error in vesa_getmodeinfo\n");
return -1;
}
mi.size = mode_info.BytesPerScanLine * mode_info.YResolution;
mi.address = mode_info.PhysBasePtr;
if (-1 == __dpmi_physical_address_mapping(&mi))
{
thin_printf("thinlib.vesa: error in __dpmi_physical_address_mapping\n");
return -1;
}
if (false == vesa_hardware)
{
vid_selector = __dpmi_allocate_ldt_descriptors(1);
if (-1 == vid_selector)
{
thin_printf("thinlib.vesa: error in __dpmi_allocate_ldt_descriptors\n");
return -1;
}
/* paranoid */
if (-1 == __dpmi_set_descriptor_access_rights(vid_selector, 0x40f3))
{
thin_printf("thinlib.vesa: error in __dpmi_set_descriptor_access_rights\n");
return -1;
}
if (-1 == __dpmi_set_segment_base_address(vid_selector, mi.address))
{
thin_printf("thinlib.vesa: error in __dpmi_set_segment_base_address\n");
return -1;
}
if (-1 == __dpmi_set_segment_limit(vid_selector, total_memory << 16 | 0xfff))
{
thin_printf("thinlib.vesa: error in __dpmi_set_segment_limit\n");
return -1;
}
}
memset(®s, 0, sizeof(regs));
regs.x.ax = VBE_FUNC_SETMODE;
regs.x.bx = mode | VBE_LINEAR_ADDR;
__dpmi_int(VBE_INT, ®s);
if (VBE_SUCCESS != regs.x.ax)
{
thin_printf("thinlib.vesa: vesa dpmi int failed\n");
return -1;
}
if (false == vesa_hardware)
address = 0;
else
address = mi.address;
if (NULL != screen)
thin_bmp_destroy(&screen);
if (vesa_hardware)
{
screen = thin_bmp_createhw((uint8 *) THIN_PHYSICAL_ADDR(address),
mode_info.XResolution, mode_info.YResolution,
mode_info.BitsPerPixel, mode_info.XResolution);
if (NULL == screen)
{
thin_printf("thinlib.vesa: failed creating hardware surface\n");
return -1;
}
}
else
{
if (NULL != hardware)
thin_bmp_destroy(&hardware);
hardware = thin_bmp_createhw((uint8 *) address,
mode_info.XResolution, mode_info.YResolution,
mode_info.BitsPerPixel, mode_info.XResolution);
if (NULL == hardware)
{
thin_printf("thinlib.vesa: failed creating hardware surface\n");
return -1;
}
screen = thin_bmp_create(mode_info.XResolution, mode_info.YResolution,
mode_info.BitsPerPixel, 0);
if (NULL == screen)
{
thin_printf("thinlib.vesa: failed creating software surface\n");
return -1;
}
}
return 0;
}
void thin_vesa_shutdown(void)
{
__dpmi_regs regs;
/* set text mode */
memset(®s, 0, sizeof(regs));
regs.x.ax = 0x0003;
__dpmi_int(VBE_INT, ®s);
if (NULL != screen)
thin_bmp_destroy(&screen);
if (NULL != hardware)
thin_bmp_destroy(&hardware);
}
int thin_vesa_init(int width, int height, int bpp, int param)
{
screen = NULL;
hardware = NULL;
/* check to see if VESA card is present */
if (vesa_detect())
return -1;
if (thinlib_nearptr && (param & THIN_VIDEO_HWSURFACE))
vesa_hardware = true;
else
vesa_hardware = false;
return thin_vesa_setmode(width, height, bpp);
}
bitmap_t *thin_vesa_lockwrite(void)
{
return screen;
}
void thin_vesa_freewrite(int num_dirties, rect_t *dirty_rects)
{
UNUSED(num_dirties);
UNUSED(dirty_rects);
/* if we don't have a hardware surface, blat it out */
if (false == vesa_hardware)
{
_movedatal(_my_ds(), (unsigned) screen->line[0],
vid_selector, (unsigned) hardware->line[0],
hardware->pitch * hardware->height / 4);
}
}
/*
** $Log: $
*/
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